共查询到20条相似文献,搜索用时 64 毫秒
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本文用单扫描极谱法(LSP)研究了氯诺昔康的极谱行为。实验发现,以0.04mol·L-1的B-R缓冲溶液为底液,氯诺昔康在-1.87V(vs.SCE)处有一个灵敏的二阶导数极谱峰,其二阶导数极谱峰峰高与氯诺昔康的浓度在1.0×10-6mol·L-1~2.0×10-5mol·L-1范围内呈较好的线性关系,相关系数为0.9985,检出限为0.04753mol.L-1。实验结果显示,该方法测定氯诺昔康快速、准确、可靠。 相似文献
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槟榔碱主要存在于棕榈科植物槟榔的种子内。槟榔是我国目前亟待开发的天然植物资源,广泛分布于海南、广西、云南、福建及台湾等地。槟榔碱味辛、温,具有杀虫、破积、下气、行水的功能。由于槟榔碱对M—胆碱受体的作用,平时嚼食槟榔,可促使唾液分泌增加、增进 相似文献
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The electrochemical behaviour of cefminox in phosphate buffers solutions over pH range 2.0-9.0 using differential-pulse polarography, DC-tast polarography, cyclic voltammetry and linear sweep voltammetry (staircase) has been studied. In acidic media, a non reversible diffusion-controlled reduction involving two electrons occurs and the mechanism for the reduction was suggested. A differential-pulse polarographic method for the determination of cefminox in the concentration range 5.8×10−6-6.0×10−5 M with a detection limit of 1.76×10−6 M was proposed. Also, a method based on controlled adsorptive pre-concentration of cefminox on the hanging mercury drop electrode followed by linear sweep voltammetry, allows its determination in the concentration range 8.3×10−8-1.5×10−6 M with a detection limit of 2.47×10−8 M. These methods have been used for the direct determination of cefminox in human urine with recoveries between 98 and 103%, and precision around ±2%. 相似文献
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《Journal of Chemical Sciences》1988,100(1):27-29
The electroanalytical behaviour of 5-nitroorotic acid has been studied at several pH values, using several techniques (DC
and DP polarography and CV).
The 5-nitroorotic acid undergoes five irreversible diffusion-controlled reduction waves over entire pH range considered. The
optimum conditions for determination of 5-nitroorotic acid-with the above technique are also studied. 相似文献
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本文介绍了线性扫描极谱法测定植物组织中金属硫肽含量的技术,其最小检出量为0.16μg/ml;线性范围为0.2-2.0μg/ml;回收率为90%左右。本文还对pH影响及巯基物质的干扰进行了分析。所有结果表明,本方法简易,快速,灵敏等特点。野外调测进一步表明,本方法适用于环境监测等实用分析。 相似文献
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An electroanalytical method for the determination of morpholine, a corrosion inhibitor, was developed at a cathodically pretreated boron-doped diamond electrode (BDDE). The voltammetric response of morpholine at the BDDE in 0.1?mol L?1 KCl (pH 10) shows an irreversible oxidation process at approximately 1.3?V vs. Ag/AgCl in 3.0?mol L?1 KCl. Using cyclic voltammetry, the number of electrons involved in the morpholine electroxidation mechanism was found to be 1. The application of chronoamperometry showed that the apparent diffusion coefficient (D0) was 2.99?×?10?6 cm2 s?1. Using square wave voltammetry under the optimized conditions (frequency of 30.0?Hz, pulse amplitude of 100?mV and step potential of 20?mV at pH 10.0), the developed method provided limits of detection and quantification of 2.1 and 6.9?mg L?1, respectively, with a linear range from 5.0 to 100.0?mg L?1 (r?=?0.991). Intraday (n?=?10) and interday (two consecutive day) precision values assessed as the relative standard deviation for solutions containing 30.0, 60.0, and 90.0?mg L?1 of morpholine were from 0.41 to 5.86% and 0.92 to 3.19%, respectively. The feasibility of the method for the interference-free determination of morpholine was verified by the analysis of synthetic boiler water samples containing CaCO3, Na2SO3, Na3PO4, FeCl3, and humic acid as organic matter. In addition, hydrazine was added as a possible interfering compound because of its widespread use in corrosion inhibition. Recovery values from 90.9 to 109.4% were obtained in the synthetic boiler water, thereby attesting to the accuracy of the method. 相似文献
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《Electroanalysis》2004,16(3):231-237
The electrochemical oxidation of antipsychotic drug amisulpride (AMS) has been studied in pH range 1.8–11.0 at a stationary glassy carbon electrode by cyclic, differential pulse and square‐wave voltammetry. Two oxidation processes were produced in different supporting electrolyte media. Both of the oxidation processes were irreversible and exhibited diffusion controlled. For analytical purposes, very resolved voltammetric peaks were obtained using differential pulse and square‐wave modes. The linear response was obtained in the range of 4×10?6 to 6×10?4 M for the first and second oxidation steps in Britton‐Robinson buffer at pH 7.0 and pH 3.0 (20% methanol v/v), respectively, using both techniques. These methods were used for the determination of AMS in tablets. The first oxidation process was chosen as indicative of the analysis of AMS in biological media. The methods were successfully applied to spiked human serum, urine and simulated gastric fluid samples. 相似文献
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本研究利用含参数积分的导数运算,Reimann-Stielties积分展开,推导了固态平面电极下的线性扫描平行催化伏安法的电流理论方程。所得方程直观明了,各种参数之间的关系较清晰,为无限加和形式,可以精确计算任何kf值的电流理论值,整个过程仅需个人计算机即可完成。 相似文献
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The reduction of 7-chloro-1,3-dihydro-1-methyl-5-phenyl-2H-1,4-benzodiazepine-2-one at the dropping mercury electrode has
been investigated. The process is diffusion controlled; furthermore, the reduction wave enables the quantitative determination
of the drug both in acid and basic media. The reagent captures two electrons and two hydrogen ions. A disproportionation reaction
of the hydrazo-compound takes place, and amines are the final reduction products. 相似文献
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噻吩甲酰三氟丙酮的电化学性质及应用 总被引:1,自引:0,他引:1
在 0 .5mol/LHCl和 0 .2g/L的明胶溶液中 ,利用线性扫描极谱法测定噻吩甲酰三氟丙酮 (简称TTA) ,发现有一还原峰 ,其峰电位是 - 1 .0 0V (vs.SCE)。峰电流与TTA浓度在 2 .5× 1 0 - 5mol/L~ 2 .0× 1 0 - 3mol/L之间存在线性关系 (r=0 .9986) ,检测下限为 1 .0× 1 0 - 5mol/L。利用单扫描极谱法和循环伏安法对极谱峰的电化学性质进行了研究 相似文献